1 /*
2 * Marvell Wireless LAN device driver: 802.11n Aggregation
3 *
4 * Copyright (C) 2011-2014, Marvell International Ltd.
5 *
6 * This software file (the "File") is distributed by Marvell International
7 * Ltd. under the terms of the GNU General Public License Version 2, June 1991
8 * (the "License"). You may use, redistribute and/or modify this File in
9 * accordance with the terms and conditions of the License, a copy of which
10 * is available by writing to the Free Software Foundation, Inc.,
11 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA or on the
12 * worldwide web at http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt.
13 *
14 * THE FILE IS DISTRIBUTED AS-IS, WITHOUT WARRANTY OF ANY KIND, AND THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE
16 * ARE EXPRESSLY DISCLAIMED. The License provides additional details about
17 * this warranty disclaimer.
18 */
19
20 #include "decl.h"
21 #include "ioctl.h"
22 #include "util.h"
23 #include "fw.h"
24 #include "main.h"
25 #include "wmm.h"
26 #include "11n.h"
27 #include "11n_aggr.h"
28
29 /*
30 * Creates an AMSDU subframe for aggregation into one AMSDU packet.
31 *
32 * The resultant AMSDU subframe format is -
33 *
34 * +---- ~ -----+---- ~ ------+---- ~ -----+----- ~ -----+---- ~ -----+
35 * | DA | SA | Length | SNAP header | MSDU |
36 * | data[0..5] | data[6..11] | | | data[14..] |
37 * +---- ~ -----+---- ~ ------+---- ~ -----+----- ~ -----+---- ~ -----+
38 * <--6-bytes--> <--6-bytes--> <--2-bytes--><--8-bytes--> <--n-bytes-->
39 *
40 * This function also computes the amount of padding required to make the
41 * buffer length multiple of 4 bytes.
42 *
43 * Data => |DA|SA|SNAP-TYPE|........ .|
44 * MSDU => |DA|SA|Length|SNAP|...... ..|
45 */
46 static int
mwifiex_11n_form_amsdu_pkt(struct sk_buff * skb_aggr,struct sk_buff * skb_src,int * pad)47 mwifiex_11n_form_amsdu_pkt(struct sk_buff *skb_aggr,
48 struct sk_buff *skb_src, int *pad)
49
50 {
51 int dt_offset;
52 struct rfc_1042_hdr snap = {
53 0xaa, /* LLC DSAP */
54 0xaa, /* LLC SSAP */
55 0x03, /* LLC CTRL */
56 {0x00, 0x00, 0x00}, /* SNAP OUI */
57 0x0000 /* SNAP type */
58 /*
59 * This field will be overwritten
60 * later with ethertype
61 */
62 };
63 struct tx_packet_hdr *tx_header;
64
65 tx_header = (void *)skb_put(skb_aggr, sizeof(*tx_header));
66
67 /* Copy DA and SA */
68 dt_offset = 2 * ETH_ALEN;
69 memcpy(&tx_header->eth803_hdr, skb_src->data, dt_offset);
70
71 /* Copy SNAP header */
72 snap.snap_type = ((struct ethhdr *)skb_src->data)->h_proto;
73
74 dt_offset += sizeof(__be16);
75
76 memcpy(&tx_header->rfc1042_hdr, &snap, sizeof(struct rfc_1042_hdr));
77
78 skb_pull(skb_src, dt_offset);
79
80 /* Update Length field */
81 tx_header->eth803_hdr.h_proto = htons(skb_src->len + LLC_SNAP_LEN);
82
83 /* Add payload */
84 memcpy(skb_put(skb_aggr, skb_src->len), skb_src->data, skb_src->len);
85
86 /* Add padding for new MSDU to start from 4 byte boundary */
87 *pad = (4 - ((unsigned long)skb_aggr->tail & 0x3)) % 4;
88
89 return skb_aggr->len + *pad;
90 }
91
92 /*
93 * Adds TxPD to AMSDU header.
94 *
95 * Each AMSDU packet will contain one TxPD at the beginning,
96 * followed by multiple AMSDU subframes.
97 */
98 static void
mwifiex_11n_form_amsdu_txpd(struct mwifiex_private * priv,struct sk_buff * skb)99 mwifiex_11n_form_amsdu_txpd(struct mwifiex_private *priv,
100 struct sk_buff *skb)
101 {
102 struct txpd *local_tx_pd;
103 struct mwifiex_txinfo *tx_info = MWIFIEX_SKB_TXCB(skb);
104 unsigned int pad;
105 int headroom = (priv->adapter->iface_type ==
106 MWIFIEX_USB) ? 0 : INTF_HEADER_LEN;
107
108 pad = ((void *)skb->data - sizeof(*local_tx_pd) -
109 headroom - NULL) & (MWIFIEX_DMA_ALIGN_SZ - 1);
110 skb_push(skb, pad);
111
112 skb_push(skb, sizeof(*local_tx_pd));
113
114 local_tx_pd = (struct txpd *) skb->data;
115 memset(local_tx_pd, 0, sizeof(struct txpd));
116
117 /* Original priority has been overwritten */
118 local_tx_pd->priority = (u8) skb->priority;
119 local_tx_pd->pkt_delay_2ms =
120 mwifiex_wmm_compute_drv_pkt_delay(priv, skb);
121 local_tx_pd->bss_num = priv->bss_num;
122 local_tx_pd->bss_type = priv->bss_type;
123 /* Always zero as the data is followed by struct txpd */
124 local_tx_pd->tx_pkt_offset = cpu_to_le16(sizeof(struct txpd) +
125 pad);
126 local_tx_pd->tx_pkt_type = cpu_to_le16(PKT_TYPE_AMSDU);
127 local_tx_pd->tx_pkt_length = cpu_to_le16(skb->len -
128 sizeof(*local_tx_pd) -
129 pad);
130
131 if (tx_info->flags & MWIFIEX_BUF_FLAG_TDLS_PKT)
132 local_tx_pd->flags |= MWIFIEX_TXPD_FLAGS_TDLS_PACKET;
133
134 if (local_tx_pd->tx_control == 0)
135 /* TxCtrl set by user or default */
136 local_tx_pd->tx_control = cpu_to_le32(priv->pkt_tx_ctrl);
137
138 if (GET_BSS_ROLE(priv) == MWIFIEX_BSS_ROLE_STA &&
139 priv->adapter->pps_uapsd_mode) {
140 if (true == mwifiex_check_last_packet_indication(priv)) {
141 priv->adapter->tx_lock_flag = true;
142 local_tx_pd->flags =
143 MWIFIEX_TxPD_POWER_MGMT_LAST_PACKET;
144 }
145 }
146 }
147
148 /*
149 * Create aggregated packet.
150 *
151 * This function creates an aggregated MSDU packet, by combining buffers
152 * from the RA list. Each individual buffer is encapsulated as an AMSDU
153 * subframe and all such subframes are concatenated together to form the
154 * AMSDU packet.
155 *
156 * A TxPD is also added to the front of the resultant AMSDU packets for
157 * transmission. The resultant packets format is -
158 *
159 * +---- ~ ----+------ ~ ------+------ ~ ------+-..-+------ ~ ------+
160 * | TxPD |AMSDU sub-frame|AMSDU sub-frame| .. |AMSDU sub-frame|
161 * | | 1 | 2 | .. | n |
162 * +---- ~ ----+------ ~ ------+------ ~ ------+ .. +------ ~ ------+
163 */
164 int
mwifiex_11n_aggregate_pkt(struct mwifiex_private * priv,struct mwifiex_ra_list_tbl * pra_list,int ptrindex,unsigned long ra_list_flags)165 mwifiex_11n_aggregate_pkt(struct mwifiex_private *priv,
166 struct mwifiex_ra_list_tbl *pra_list,
167 int ptrindex, unsigned long ra_list_flags)
168 __releases(&priv->wmm.ra_list_spinlock)
169 {
170 struct mwifiex_adapter *adapter = priv->adapter;
171 struct sk_buff *skb_aggr, *skb_src;
172 struct mwifiex_txinfo *tx_info_aggr, *tx_info_src;
173 int pad = 0, aggr_num = 0, ret;
174 struct mwifiex_tx_param tx_param;
175 struct txpd *ptx_pd = NULL;
176 struct timeval tv;
177 int headroom = adapter->iface_type == MWIFIEX_USB ? 0 : INTF_HEADER_LEN;
178
179 skb_src = skb_peek(&pra_list->skb_head);
180 if (!skb_src) {
181 spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock,
182 ra_list_flags);
183 return 0;
184 }
185
186 tx_info_src = MWIFIEX_SKB_TXCB(skb_src);
187 skb_aggr = mwifiex_alloc_dma_align_buf(adapter->tx_buf_size,
188 GFP_ATOMIC | GFP_DMA);
189 if (!skb_aggr) {
190 dev_err(adapter->dev, "%s: alloc skb_aggr\n", __func__);
191 spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock,
192 ra_list_flags);
193 return -1;
194 }
195 skb_reserve(skb_aggr, MWIFIEX_MIN_DATA_HEADER_LEN);
196 tx_info_aggr = MWIFIEX_SKB_TXCB(skb_aggr);
197
198 memset(tx_info_aggr, 0, sizeof(*tx_info_aggr));
199 tx_info_aggr->bss_type = tx_info_src->bss_type;
200 tx_info_aggr->bss_num = tx_info_src->bss_num;
201
202 if (tx_info_src->flags & MWIFIEX_BUF_FLAG_TDLS_PKT)
203 tx_info_aggr->flags |= MWIFIEX_BUF_FLAG_TDLS_PKT;
204 tx_info_aggr->flags |= MWIFIEX_BUF_FLAG_AGGR_PKT;
205 skb_aggr->priority = skb_src->priority;
206
207 do_gettimeofday(&tv);
208 skb_aggr->tstamp = timeval_to_ktime(tv);
209
210 do {
211 /* Check if AMSDU can accommodate this MSDU */
212 if (skb_tailroom(skb_aggr) < (skb_src->len + LLC_SNAP_LEN))
213 break;
214
215 skb_src = skb_dequeue(&pra_list->skb_head);
216 pra_list->total_pkt_count--;
217 atomic_dec(&priv->wmm.tx_pkts_queued);
218 aggr_num++;
219 spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock,
220 ra_list_flags);
221 mwifiex_11n_form_amsdu_pkt(skb_aggr, skb_src, &pad);
222
223 mwifiex_write_data_complete(adapter, skb_src, 0, 0);
224
225 spin_lock_irqsave(&priv->wmm.ra_list_spinlock, ra_list_flags);
226
227 if (!mwifiex_is_ralist_valid(priv, pra_list, ptrindex)) {
228 spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock,
229 ra_list_flags);
230 return -1;
231 }
232
233 if (skb_tailroom(skb_aggr) < pad) {
234 pad = 0;
235 break;
236 }
237 skb_put(skb_aggr, pad);
238
239 skb_src = skb_peek(&pra_list->skb_head);
240
241 } while (skb_src);
242
243 spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, ra_list_flags);
244
245 /* Last AMSDU packet does not need padding */
246 skb_trim(skb_aggr, skb_aggr->len - pad);
247
248 /* Form AMSDU */
249 mwifiex_11n_form_amsdu_txpd(priv, skb_aggr);
250 if (GET_BSS_ROLE(priv) == MWIFIEX_BSS_ROLE_STA)
251 ptx_pd = (struct txpd *)skb_aggr->data;
252
253 skb_push(skb_aggr, headroom);
254 tx_info_aggr->aggr_num = aggr_num * 2;
255 if (adapter->data_sent || adapter->tx_lock_flag) {
256 atomic_add(aggr_num * 2, &adapter->tx_queued);
257 skb_queue_tail(&adapter->tx_data_q, skb_aggr);
258 return 0;
259 }
260
261 if (adapter->iface_type == MWIFIEX_USB) {
262 adapter->data_sent = true;
263 ret = adapter->if_ops.host_to_card(adapter, MWIFIEX_USB_EP_DATA,
264 skb_aggr, NULL);
265 } else {
266 if (skb_src)
267 tx_param.next_pkt_len =
268 skb_src->len + sizeof(struct txpd);
269 else
270 tx_param.next_pkt_len = 0;
271
272 ret = adapter->if_ops.host_to_card(adapter, MWIFIEX_TYPE_DATA,
273 skb_aggr, &tx_param);
274 }
275 switch (ret) {
276 case -EBUSY:
277 spin_lock_irqsave(&priv->wmm.ra_list_spinlock, ra_list_flags);
278 if (!mwifiex_is_ralist_valid(priv, pra_list, ptrindex)) {
279 spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock,
280 ra_list_flags);
281 mwifiex_write_data_complete(adapter, skb_aggr, 1, -1);
282 return -1;
283 }
284 if (GET_BSS_ROLE(priv) == MWIFIEX_BSS_ROLE_STA &&
285 adapter->pps_uapsd_mode && adapter->tx_lock_flag) {
286 priv->adapter->tx_lock_flag = false;
287 if (ptx_pd)
288 ptx_pd->flags = 0;
289 }
290
291 skb_queue_tail(&pra_list->skb_head, skb_aggr);
292
293 pra_list->total_pkt_count++;
294
295 atomic_inc(&priv->wmm.tx_pkts_queued);
296
297 tx_info_aggr->flags |= MWIFIEX_BUF_FLAG_REQUEUED_PKT;
298 spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock,
299 ra_list_flags);
300 dev_dbg(adapter->dev, "data: -EBUSY is returned\n");
301 break;
302 case -1:
303 if (adapter->iface_type != MWIFIEX_PCIE)
304 adapter->data_sent = false;
305 dev_err(adapter->dev, "%s: host_to_card failed: %#x\n",
306 __func__, ret);
307 adapter->dbg.num_tx_host_to_card_failure++;
308 mwifiex_write_data_complete(adapter, skb_aggr, 1, ret);
309 return 0;
310 case -EINPROGRESS:
311 if (adapter->iface_type != MWIFIEX_PCIE)
312 adapter->data_sent = false;
313 break;
314 case 0:
315 mwifiex_write_data_complete(adapter, skb_aggr, 1, ret);
316 break;
317 default:
318 break;
319 }
320 if (ret != -EBUSY) {
321 mwifiex_rotate_priolists(priv, pra_list, ptrindex);
322 }
323
324 return 0;
325 }
326